In class of boys and girls. The mean weight of 8 boys is 55kg and the mean weight of a group of girls is 48kg. The mean weight of all the children is 50.8kg. How many girls are there?
Answers
Answered by
6
Step-by-step explanation:
Let no of girls be. x
8×55+48×x=50.8(x+8)
440+48x=50.8x+406.4
440-406.4=(50.8-48)x
33.6=2.8x
x=33.6/2.8
x=12
no of girls is 12
Similar questions